Legend:

I have a recent scenario where I ran into max_input_vars - the problem turned out to be uncached database calls being made in a hierarchy loop on clean_post_cache in combination with a Google Sitemap generator running too often. Not saying that's the case here, just saying that monitoring SQL queries can often point to a piece of the software running out of control.

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I thought the form was the main culprit because I had 3 post types acting like a hierarchy Post > Section > Items and had tons of sections and items. When I turned off cache invalidation (not a solution), almost every problem went away. clean_post_cache and clean_object_term_cache can end up making an absurd number of database calls.

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I thought the form was the main culprit because I had 3 post types acting like a hierarchy Post > Section > Items and had tons of sections and items. When I turned off cache invalidation (not a solution), almost every problem went away. clean_post_cache can end up making an absurd number of database calls.